当用户关闭其中一个窗口时，WPF关闭所有窗口

There's a WPF application with multiple windows. Initially there's only one window. User may go to next windows while previous are hidden. When they return back, hidden windows appear again. The problem is that when user closes some window, the hidden ones continue to run as processes. Is it possible to close all of them when user closes any.There's a WPF application with multiple windows